地理国情普查 DOM 的制作及检查

DOM是国情普查内容的重要组成部分,是地理国情普查中调查的重要数据源。本文通过卫星影象纠正,控制点选取,全色波段影像正射纠正,多光谱影像与全色波段影像配准,多光谱影像与全色波段影像融合等技术手段,确保了DOM的精度,为国情普查的后续工作提供精确的基础资料。     

地理国情普查DOM的制作及检查

DOM是国情普查内容的重要组成部分,是地理国情普查中调查的重要数据源。本文通过卫星影象纠正,控制点选取,全色波段影像正射纠正,多光谱影像与全色波段影像配准,多光谱影像与全色波段影像融合等技术手段,确保了DOM的精度,为国情普查的后续工作提供精确的基础资料。     

地理国情普查中的遥感影像融合算法分析

地理国情普查是一项重大的国情国力调查,是全面获取地理国情信息的重要手段,是掌握地表自然、生态及人类活动基本情况的基础性工作。影像融合旨在生成具有高空间分辨率和高光谱分辨率的遥感影像,为地理国情普查提供基础数据。然而目前影像融合算法虽多却没有一种普适性算法能够有效应用于各种需求,因此需要根据地理国情普查的实际需求分析,以获取较为合适的融合算法。     

基于变化检测的地理国情监测数据更新研究

地理国情监测数据的更新是自然资源调查监测的一项重要工作,如何基于遥感影像,实现变化信息的快速提取是一个热点。本文以句容市为研究区域,充分利用2018年地理国情监测数据与2019年遥感影像数据,通过棋盘分割法得到规则的影像,共选取植被、构筑物、水体样本134.32 m^(2),利用监督分类中最邻近分类法对影像进行分类,并通过2019年地理国情监测数据进行精度评定,符合率为79.5%。实验结果表明,棋盘分割与监督分类结合可有效提取地表地物的信息,遥感影像变化检测技术可为地理国情监测数据更新提供技术支撑。     

地理国情普查外业调查技术要求

地理国情外业调查是地理国情普查工作十分重要的工作内容,是保证地理国情普查数据质量的关键环节。外业调查是对采集的地理国情要素和解译的地表覆盖分类成果以及内业无法定性的类型、边界和属性进行实地调查,同时采集遥感影像样本数据,为最终形成地理国情要素数据、地表覆盖分类数据成果和遥感影像解译样本数据库提供基础。     

无或稀少控制地区地理国情普查DOM生产技术方法研究

利用高分辨率卫星影像获取地理国情信息是地理国情普查工作的重要技术手段。选取QuickBird、WorldView和资源3号等高分辨率卫星影像,在研究无或稀少控制及不同DEM数据对影像纠正精度影响的基础上,提出地理国情普查DOM生产技术方法,供缺少地理信息数据资料的普查区域进行DOM纠正时参考。     

省级地理国情监测质量控制的要点及策略

2021年地理国情监测工作在自然资源统一调查监测评价框架下进行,省级监测任务中的人工建(构)筑物监测、林草资源监测以及其他监测工作是利用国家基础地理信息中心下发的图斑底图数据和要素底图数据,结合遥感影像进行变化监测。对形成的监测图斑数据成果质量问题及工作中遇到的典型问题进行分析总结,归纳年度监测工作中的质量控制要点及应对策略,为提高地理国情监测工作效率和成果质量提供借鉴。     

地理国情监测与国土三调成果数据融合研究

随着我国自然资源统一调查监测体系建设的不断推进,作为我国土地覆盖数据调查中的两项重要工作,地理国情监测与国土三调将扮演越来越重要的角色,同时二者的融合具有重要的应用价值。针对地理国情监测与国土三调间的成果数据融合问题,本文首先结合地理国情监测数据的自然属性与国土三调数据的管理属性,对二者存在的共同性与差异性进行分析,全面研究与分析了地理国情监测与国土三调成果数据融合的技术流程;其次通过实现地理国情监测与国土三调的数据融合解决二者间的差异;最后对数据融合中存在的分类及采集规则进行了优化。     

期刊博览

正资源三号卫星影像融合方法探讨(《测绘科学》2015年第12期如何有效地将资源三号卫星获取的全色影像和多光谱影像融合及影像增强,使得融合后的影像具有较高的纹理细节辨识能力,目前还没有统一的融合及波段组合方法。解决好这个技术问题,将会在国家1︰5万地形数据库动态更新、地理国情监测、水土流失动态评估等项目中发挥重要作用。文章提出了利用目前测     

基于地理国情普查高分辨率卫星遥感数据正射影像制作

随着卫星遥感技术的不断发展,卫星影像成图精度越来越高,利用高分辨率卫星影像获取地理国情信息是地理国情普查工作的重要技术手段。本文以QuickBird、WorldView卫星遥感数据处理为例,描述了将Geoway CIPS集群式遥感影像处理软件和Inpho软件相结合,进行正射影像图制作中纠正、融合、匀光匀色等技术流程和工作方法。此方法可提高影像整体质量,有效地减少影像调色工作,从而提高影像生产效率。     

阿克苏河-塔里木河水系水质污染遥感监测与评价

 采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的 污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体 污染变化曲线,得出污染物浓度随着远离上游而增加。     

Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data

The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw.     

Landslide risk analysis between Giri and Tons Rivers in Himachal Himalaya (India)

The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies.     

Gravity Changes Before Large Earthquakes in China: 1998-2005

Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200...     

GNSS系统及其技术的发展研究

阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议.     

“4D”技术及其应用

介绍“４Ｄ”（即数字地面模型、数字正射影像、数字栅格地图和数字线划地图）系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。     

Virtual Australia: its key elements – know,think, communicate

Abstract

Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised.     

Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services

Location-Based Services (LBS),an emerging new business based on smartphone and mobile networks,are becoming more and more popular.Most of these LBSs,however,only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role.Our specific aim is to solve these issues.This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders.     

GIS空间数据的采集误差及其分析

本文详细阐述了GIS数据采集过程中的误差来源，重点分析了通过地图、遥感和摄影测量等方式采集数据所产生的误差及其特性，分析了其对GIS数据的影响与消减方法。     

地理数据库的关系模型及其实现

本文从以图论观点分析地理实体入手,系统阐述了地理数据库关系模型的设计法和过程。作者于1984年4～9月间在微型机上设计建立了关系型地理数据库的实方验系统(RGDB)。该系统采用了本文提出的关系模型,采用了可动态扩库的子库组合结构,这种结构具有灵活性和提高空间利用率的优点。RGDB含有多种功能的数据操作命令,除了具有一般检索功能外,还能进行“开窗”选取和十分“自由”的映象选取。本文对RGDB系统的主要性能和实现途径作了扼要介绍。